Gill-Virden Company 
— Philadelphia Pu, USA 








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GILL-VIRDEN COMPANY, Inc. 


AMBER AND VENANGOSTS., PHILADELPHIA, U.S.A. 


Digitized by the Internet Archive 
in 2022 with funding from 
Columbia University Libraries 


https://archive.org/details/scientificunit0Ogill 





NO onthe’ Chiz 


HE gradual utilization and the practical application of known scientific principles to every 
problem of transportation, inter-communication, construction and illumination provide a 
startling and amazing panorama of progress. 


It is, however, in the practical and efficient utilization of electricity for illumination that we are 
intimately and immediately concerned. In this particular phase of scientific research and 
investigation, progress has been as startling and amazing as in any other, and we now offer 
to the trade the “SCIENTIFIC” unit as the most advanced method of illumination yet 
developed. 


The “SCIENTIFIC” unit is vastly superior to any other unit now manufactured, as it is built 
to meet the most modern conception of correct illumination. The “SCIENTIFIC” unit is 
composed of three separate and distinct parts, but merged into one efficient and attractive 
unit. Its primary object is to provide a maximum of illumination, both direct and indirect. 
The “SCIENTIFIC” unit consists of a canopy of Hyperion glass, a Crystal Reflector and a 
Diffusing Bowl, also of Hyperion glass. The light is projected directly on the working plane 
by the bottom diffusing bowl and indirectly by the crystal reflector which projects the light on 
the white glass canopy which, in turn, directs it to useful planes. 


The “SCIENTIFIC” unit successfully controls light and gives a greater light output than any 
other unit, as the reflector is made of Crystal glass and naturally, absorbs a negligible percent- 
age of light and thus, the total light output of the unit, as a whole, is considerably more than 
that of any style heretofore on the market. 


The efficiency of the ceiling type is such as to render the pendant type unnecessary in most 
installations, as the combination of crystal reflector with white diffusing glass canopy gives a 
wide range of distribution and will project more light on the working plane than any other 
unit in the pendant type. The “SCIENTIFIC” unit can, of course, be furnished in the pendant 
type, but in such case the unit will consist of the bowl and the reflector only, without the glass 
canopy. 


In every science, advance in theoretical knowledge is followed by its practical application, and 
the development of the “SCIENTIFIC” unit is the logical sequence of the latest acceptation of 
what constitutes correct illumination. A physical examination, only, will disclose the reason 
for its superiority, and this conclusion will be confirmed by its performance in operation. 
The “SCIENTIFIC” unit is protected by basic as well as design patents. 


GILL-VIRDEN Company, INC. 


[ Three ] 


{ Four } 


Method of Installation 


Installing a Scientific Unit is so extremely simple that it requires only about ten minutes for the entire 
operation and while the method will be obvious and without complication to any competent electrician the 
accompanying sketch and detailed instructions are furnished so that a helper or layman will experience no 
difficulty in making the installation. 


““A”——Make regular connection of “pigtail recep- 
tacle No. 1” to lead wires. 


“B”—Attach “crossbar and supporting rods No. 


2’ to fixture stud or ears of outlet box. arate Sot TE 


“C”—Place “reflector No. 3” over supporting rods 
and flush against ceiling and secure by in- |_| 
serting “reflector supporting cup No. 4” | ™ : CROSSBAR AND. 
through opening in reflector and over ‘‘re- 
flector supporting nuts No. 5,” turning cup 


to right as far as possible and tightening 





nuts. 


“D”—Pull “receptacle No. 1” through opening 
in “reflector supporting cup No. 4,” 
unscrew porcelain ring, attach ‘“‘refractor 
supporting disc No. 6” to receptacle and 
replace porcelain ring. 


“E”—Draw ‘refractor supporting disc No. 6” 
with receptacle attached through neck of 
“prismatic refractor No. 7’ and secure same 
by slipping supporting disc over ‘‘refractor 
nuts No. 8” and tightening. 


= 
~~ 


“F”—After inserting Lamp, slide “bowl No. 9” 
through notches over flange of ‘“‘refractor 
No. 7” and adjust bowl so that it will seat 
horizontally on refractor flange. 


NOTE.—When equipped with Mogul 
Socket an extra crossbar attached to 
supporting rods will carry socket, and 
will be adjustable up or down. ‘‘Sup- 
porting disc No. 6” will then be used 
only as a means of securing ‘‘prismatic 
refractor No. 7” to “Crossbar and sup- 
porting rods No. 1.” 





Photometric Test 


The Candle power distribution of the Scientific Unit shown above indicates that our new unit has a light efficiency of 89%, that is, 
89% of the light generated by the lamp is ultimately diffused by the Luminaire. However, efficiency in Luminaires has or ought to 
have, a much more comprehensive and exact meaning than is generally given it. Real efficiency is not restricted to the percentage of 
light output diffused by the Luminaire which, because it is often the most obvious and patent, is frequently regarded as the most 
important. If that were true, however, the most efficient Luminaire would be the bare lamp which has a total light output of 
100%. True efficiency means, however, in addition to percentage of light output, absence of glare and possibly, most important of 
all, the projection of light on useful planes. It is possible, for example, to visualize a unit with a light output of 98%, which yet 
might be a highly inefficient Luminaire, first because it is haphazard in operation, and secondly because it is glaring in appearance. 
Percentage of light output, therefore, is merely the first step in considering the merits of any unit as a Luminaire. It is not the most 
important, and in fact in very many cases, is secondary to the most important question of all: What is really done with the light 
diffused by the unit? The Photometric test shown above shows a very high light output of 89%, for the Scientific Unit, but what 
it does not show is that practically all the light is controlled and is projected on useful planes, first by the Diffusing Bowl, and 
secondly by the White Glass Canopy. Nothing has been left to chance, and a successful effort has been made to flood the working 
plane with a soft full light, free from glare. Our aim has been to design a unit of high light output, and primarily equipped to 
utilize this light in the most effective manner. 


{ Five } 


{ Six ] 


‘Nurenttiw Unit (Plain White Finish) 








Numbers 75, 76 and 77 


Equipped with Edison Base Porcelain Socket. If Mogul Socket is wanted please so specify and add 60c to list. 
PLAIN UNIT—The “SCIENTIFIC” UNIT, as illustrated, consists of a diffusing bowl of HYPERION glass and crystal re- 
flector, and a white glass canopy. While it is extremely graceful in appearance and particularly so when illuminated, it is designed 
primarily for efficiency, and for the projection of a maximum illumination on the working plane. This result is attained by 
direct diffusion through the bottom bowl, and indirectly through the crystal reflector and redirected by the glass canopy. 
“DAYLITE GLASS”—There are certain specific conditions which require a quality of light approximating daylight. This 
is true, for example, where close matching of colors is desired or where, for any purpose, the daylight effect is of prime 
importance. The “SCIENTIFIC” UNIT can be furnished in this type of glass, and the resultant diffusion of light is as close 
an approximation of daylight as it is possible to obtain. Our “DAYLITE” glass is not a cased glass, but a one-piece glass, 
and is practically as efficient, so far as light output is concerned, as the plain Hyperion unit. The quality of light which it 
projects however, is as stated above, a very close approximation of daylight, and its light weight and high efficiency make 
it a singularly appropriate unit for the purpose for which it is designed. 


If Day-Lite Glass is wanted order No. 78, 79 or 80. 


Unit Diameter | Diameter Length Quantity to Carton Weight of Carton Price Each 
Number of Canopy | of Bottom Bow! Overall | Dozen | Pounds Complete 
| 

















75 16"' 12"! | 15" 


ial 15 $12.75 
76 16"! 14" 16"' 1/12 16 13.50 
77 16" 16" 17"! 1/12 19 16.50 
78 16" 12" 15" 1/12 15 14.01 
79 16" 14" 16"' 1/12 16 14.85 
80 16"! 16" 17"! 1/12 19 18.15 








Furnished with Levolier Switch at advance of $2.25 each list. 


‘Nuentifiw’ Unit (Marble Finish) 





Numbers 84, 85 and 86 


Equipped with Edison Base Porcelain Socket. If Mogul Socket is wanted please so specify 
and add 60c to list. 


A very unusual and unique decorative effect is illustrated above, which is extremely attractive and 
peculiarly adapted for certain specific conditions. The decoration shown simulates the peculiar configura- 
tion of marble and, as a matter of fact, the unit seems in reality to be constructed from a luminous piece 
of marble. It is peculiarly adapted as a harmonizing factor in hotels, banks, hospitals and wherever 
marble trimming is used in construction. 



















































Unit Diameter Diameter Length Quantity to Carton Weight of Carton Price Each 
of Canopy of Bottom Bowl Overall Dozen Pounds | Complete 
16"' WP r5S! 1/12 15 $15.75 
85 16. 14" 16"' ita Wee 16 16.50 
16%) 16"' ye 1/12 19 | 20.25 








Furnished with Levolier Switch at advance of $2.25 each list. 


[ Seven } 


Worentifiw’ Unit (Etched Finish) 





Numbers 81, 82 and 83 


Equipped with Edison Base Porcelain Socket. If wanted with Mogul Socket please so specify 
and add 60c to list. 


Where decorative illumination is desirable, the “SCIENTIFIC” UNIT can be furnished with etched 
design, as shown above. An effort has been made to furnish the decorative treatment without impairing 
the efficiency of the unit itself. As a matter of fact, the unit, even in the plain combination, is extremely 
graceful in appearance, the contrast between the clear crystal of the reflector and the white glass of the 


canopy and bowl is very striking and pleasing. In the etched design, however, its normal attractive 
appearance is, of course, emphasized and enhanced. 





















































Diameter Diameter Length Quantity to Carton Weight of Carton Price Each 

of Canopy of Bottom Bowl Overall Dozen Pounds Complete 
81 | ibe iby 1/12 | 15 $15.05 
82 | ton LA 16" 1/12 16 16.50 
83 16"' | 16" jira 1/12 19 20.25 





Furnished with Levolier Switch at advance of $2.25 each list. 


[ Eight } 


“Wurentifiv’ Unit (Ivory Finish) 


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Numbers 87, 88 and 89 


Equipped with Edison Base Porcelain Socket. If Mogul Socket is desired please so specify 
and add 60c to list. 


This treatment of the “SCIENTIFIC” UNIT is recommended wherever it is desired that indirect illumina- 
tion dominate. The bowl is decorated in a pleasing neutral color, restful to the eye and a large percentage 
of the light is projected by the crystal reflector on the white canopy and redirected to the working plane. 
The unit is not only efficient, but decorative and serves to illustrate the varied possibilities of the 


SCIEN LIE Ge UNE: 








Unit Diameter Diameter Length Quantity to Carton Weight of Carton | Price Each 
Number of Canopy of Bottom Bowl Overall Dozen Pounds Complete 





$13.95 


87 | 16"! 12" 15" 1/12 15 
88 16"' 14"! 16" 1/12 16 | 14.70 
89 16" 16" iT fl 1/12 19 18.00 





Furnished with Levolier Switch at advance of $2.25 each list. 


[ Nine ] 


{ Ten } 


Nuentifin Unit (Pendant Type) 


STATUARY BRONZE PENDANT 





TT 


Numbers 44/90, 44/91 and 44/92 


Deep flanged canopy with knockout. Equipped with special approved receptacle and asbestos wire. 
If Mogul Socket is desired please so specify and add 60c to list. 


In designing the “SCIENTIFIC” UNIT, it was the thought of our engineers that the ceiling type, because of its 
unusual efficiency, would render the pendant type in large measure unnecessary, and in fact, where ceilings are not over 
14 ft. in height the “SCIENTIFIC” UNIT in the ceiling type will be found eminently satisfactory and efficient. There 
are, however, undoubtedly unusual conditions which will require the pendant type, and the illustration shows how the 
“SCIENTIFIC” UNIT is furnished when this particular type is required. The bottom diffusing bowl and crystal 
reflector complete the pendant type, the combination comprising an unusually efficient unit. 


If combination of glass and fixture is wanted give combination of number of fixture and glass. 

















| . | | . . . + 
Fixture Glass | Diameter | Length | Size of | Unit Package | Unit Package | Unit Package | Price Each | Price nese Price Each 
Number | Number of Overall| Fitter | “hen Complete} Glass Only | Fixture Only | Complete | Glass Only | Fixture 
Bowl | Dozen Dozen | Only 
44 90 120 43" ANT os 1/12 1/12 24 L eel2.75 $117.00 $2.70 
44 91 14" 44" 4" 1/12 1/12 24 13.50 126.00 2.70 
44 92 16" Asi 4. LyL2 1/12 24 | 16.50 162.00 2.70 





Furnished with Levolier Switch at advance of $1.50 each list. 








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